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An atomic resolution of HLA-DR1:HA complex derived from PDB crystal structure (PDB:1HXY) with annotated critical intermolecular interactions between peptide ligand and the side chains of MHCII. Peptide backbone that formed conserved hydrogen bonds with MHCII residues (α53S and β82N) were denoted as P-1, P1 and P2 anchor residues and highlighted in yellow.
